Investors should carefully consider the investment objectives, risks, charges and expenses of a Harbor fund before investing. A summary prospectus or prospectus for this and other information is available at harborfunds.com or by calling 800-422-1050. Read it carefully before investing.

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The Adviser has contractually agreed to limit the Fund's operating expenses, excluding interest expense (if any), to 0.90%, 0.82%, 1.15%, and 1.27% for the Institutional Class, Retirement Class, Administrative Class, and Investor Class respectively, through February 28, 2019. Only the Fund's Board of Trustees may modify or terminate this agreement.

Restated to reflect current fees.

Restated to reflect current fees.

The Adviser has contractually agreed to limit the Fund's operating expenses, excluding interest expense (if any), to 0.90%, 0.82%, 1.15%, and 1.27% for the Institutional Class, Retirement Class, Administrative Class, and Investor Class respectively, through February 28, 2019. Only the Fund's Board of Trustees may modify or terminate this agreement.

Subject to an expense limitation agreement (excluding interest expense, if any) through February 28, 2019